Innovative three-screw compounding technology

Parallel co-rotating twin-screw extruders are used in compounding and granulation production lines. After more than 20 years of rapid development, the technology has become quite mature. On the other hand, traditional meshing disk and reciprocating screw extruders meet the needs of high filling compounding, and their industrialization level continues to increase.
Chaotic mixing of high-performance polymer packaging materials
The "Research and Development of Key Equipment and Technology for High-Performance Polymer Packaging Material Molding Based on Chaos Mixing" jointly developed by Huilong Company and South China University of Technology passed the scientific and technological achievements appraisal of the Guangdong Provincial Department of Science and Technology and won the national "2007 Scientific and Technological Progress Award II" Award" [Certificate No.: 2007-257], the project "Chaotic Mixing Low Energy Consumption Extruder with Multilateral Slot Convection Screw" has a nominal specific power of 0.17 kW/kg/h, which is only the national standard of 0.32 kW/kg /h, the energy saving is significant, and the overall technology and products have reached the international advanced level.
1 Using the rheological modeling method, combined with the microrheological model that controls the morphological evolution of polymer materials, the flow field in the extrusion processing of polymer materials and the morphological evolution of blends and nanocomposites were constructed. Modeling, simulation and analysis, especially theoretical research on melting, mixing and melt flow in the extruder, reveal the mechanism of how to improve melting and mixing performance and reduce energy consumption.
2 Based on the above theoretical research, the developed chaotic mixing low-energy extruder is obviously different in principle from the extruders commonly used at home and abroad: the latter takes place in the classic Maddock melting process and shear mixing, and its melting and poor mixing effect; the former produces dispersed melting and chaotic mixing, and the shear heat generated by the material is less than the heat energy required for melting, which can prevent the material from overheating and wasting energy during the melting and mixing process, and has an energy-saving effect obvious. On-site inspection by the Guangdong Provincial Technical Supervision Machinery Product Quality Supervision and Inspection Station showed that the nominal specific power (i.e. unit consumption) of the extruder is 0.17 kW/kg/h, which is the value specified in the national machinery industry standard JB/T 8061-96 [ 0.32 kW/kg/h] lower than 0.15 kW/kg/h. Comparison with the extruders of two foreign companies (Davis Standard Company of the United States and Sumitomo Heavy Machinery Modern Company of Japan) that represent the highest level of extrusion compounding in the world today shows that the extruder developed in this achievement has the highest extrusion output, and is equipped with The motor power is the lowest. This extruder also has the advantages of low extrusion melt temperature (10-20°C lower) and strong material adaptability.
⑶Based on the above-mentioned macroscopic flow field simulation and theoretical research on microscopic morphological evolution, combined with the developed chaotic mixing low-energy extruder, polymer blends (especially viscosity ratios much greater than 1) and nanocomposites ( In particular, a systematic study was conducted on the morphological evolution, dispersion state and macroscopic properties of non-polar materials such as polyolefins, which confirmed that the chaotic mixing extruder can improve processing performance and reduce processing energy consumption. In particular, it provides The stretching and folding effect is conducive to the formation of highly dispersed, flaky, intercalated or peeled morphologies, which to a certain extent solves the problem of easy agglomeration of nanoparticles in polymer material processing and greatly improves the barrier properties of packaging products. performance and mechanical properties.
⑷A chaotic mixing type low-energy extruder is used to produce EVA pre-coated films by extrusion. Compared with the conventional method of using toxic solvents to dissolve EVA and coat it on the substrate, it eliminates the emission of toxic organic solvents and It causes environmental pollution and damage to the human body; in addition, it greatly improves the adhesion performance of the extruded film and the composite substrate, realizing a "green composite process without adhesive accelerator".